[Ke...] Posted April 1, 2020 Share Posted April 1, 2020 Is there a way to calculate Eccentricity of a diameter in Calypso? Link to comment Share on other sites More sharing options...
[Ri...] Posted April 1, 2020 Share Posted April 1, 2020 Probably with Curve. GearPro can do this though. Link to comment Share on other sites More sharing options...
[Ke...] Posted April 1, 2020 Author Share Posted April 1, 2020 The only thing that pops up in Calypso HELP (aside from RT Axis), is Stepped Cylinder. I was thinking (maybe) I could recall diameters off of each feature to evaluate, using the Stepped Cylinder From HELP: "...it is possible to check the dimensional accuracy and the eccentricity of each step." ...but it doesn't say how 😕 ... I neeed help with HELP 🤣 🙁Eccentricity.png Link to comment Share on other sites More sharing options...
[Ri...] Posted April 1, 2020 Share Posted April 1, 2020 Try dropping it into a Cylindricity plot, and see if that works. Link to comment Share on other sites More sharing options...
[Ma...] Posted April 1, 2020 Share Posted April 1, 2020 Can you explain what you mean by eccentricity? In the mechanical usage this term generally means the location error from an axis of rotation. In a mathematical usage it relates to the deviation of a conic section to a circle. Are you looking for one of these or another meaning of eccentricity? Link to comment Share on other sites More sharing options...
[Ke...] Posted April 1, 2020 Author Share Posted April 1, 2020 Please sign in to view this quote. Excellent question! Given the application, I'm leaning toward the mechanical usage, which sounds suspiciously like True Position/Concentricity, Unfortunately, I was presuming the mathematical usage, which suggests a huge waste of a chunk of my day.. I'll need to confirm with the Engineer that requested the measurement.... Link to comment Share on other sites More sharing options...
[Ry...] Posted April 1, 2020 Share Posted April 1, 2020 This is why we have GD&T... there is (or should be) no debate on what a callout means. I have seen "eccentricity" as just the DISTANCE between two circles (projected on a common plane) or between a Circle and an Axis of some sort, like a cylinder. Eccentricity is half of the true position result if you go with that definition. I would calculate it as a 2D Polar Distance for circle to circle on a plane and Cartesian Distance for circle to axis. Good luck with it. Once you understand what they want, I am sure it's easy! Link to comment Share on other sites More sharing options...
[Ma...] Posted April 1, 2020 Share Posted April 1, 2020 Please sign in to view this quote. 😃 If it turns out to be the mechanical usage, it will be very easy. There are several options that will give the answer you're looking for, polar radius, distance, half of concentricity, or half of true position (technically requires 0 for nominal locations as it is a measure of non-coincidence of two axes). Good Luck! Link to comment Share on other sites More sharing options...
[Ke...] Posted April 1, 2020 Author Share Posted April 1, 2020 Thanks, guys! Link to comment Share on other sites More sharing options...
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